Vetluga River vs river

Vetluga River and river both are nouns.

Word	Noun	Adjective	Verb	Adverb
Vetluga River	Yes	No	No	No
river	Yes	No	No	No

Vetluga River (noun)	river (noun)
a river in central Russia; flows generally southward into the Volga	a large natural stream of water (larger than a creek)